Brake and tension device



Qcfi. 2, 1923.

Filed March 10. 1922 In men 01" Federated Get. 2, 1923. Y

ERVIN E. STRAWN, OF IDES MOINES, IOWA.

isnarrn Ann rnnsron' DEVICE.

Application filed March 10, 1922. Serial No. 542,810.

To all whom it may concern. Be it known that I, ERVIN E. Srraiwn, a citizen of the United States, and a resident of Des Moines, in the county of Polk and State of Iowa, have invented a certain new and useful Brake and Tension Device, of which the following is a specification.

The object ofmy invention is to provide a simple, durable and inexpensive brake and tension device, peculiarlyadapted for controlling-a roll of paper used on a printing machine. V It is well-known that where paper is fed from a roll through a printing, machine at a high rate of speed, and the machine is stopped, the momentum of the roll is likely to cause the paper to u'nroll more than should be the case. is started up agaim'the slack is taken up with a jerk and the paper is torn.

It is my purpose to provide a roller. which rests on the traveling strip of paper and tends to drop downwardly, when the machine stops and the movement of the paper ceases. The roller is; operatively connected with my brake structure, so that when the roller moves downwardly, the brake is put into operation for preventing the further-unrolling of the paper.

When the. machine starts up again, the weight of the brake actuating roller onthe paper strip or web maintains the strip under tension, so that the slack is not-taken up with a jerk. I i

With these and other objects in view, my invention consists in the construction, ar-

one parts of my device, whereby theobjects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawings, in which:

Figure 1 shows a top or plan view of a brake embodying myinvention.

Figure 2 shows a side elevation of the same and A v V Figure 3-shows a detail, vertical, sectional view taken on the line 33 of Figure 2.

In the accompanyingdrawings, whereby my invention is illustrated, I have used the reference numeral10 to'indicate generally the frame of a printing machine or thelik'e, v which supports roll. of paper and the ether and are rotatably Then when the machine parts of my device. The drum ll has the flat faces at itsends, and'has the spindles 12 rotatably mounted on the frame .101

The roll of paper 13 is supported on the drum 11 and is fed from. thence over a roller 14, which may be supported by brackets 15. g i I My improved brake and tension device consists of a roller 16 rotatably mounted on and between two parallel arms. 17. The arms 17 are secured at what may be called their rear ends to spindles or shafts 18, which are arranged in alignment with each mounted on the members of the frame 10. v

Aligned sleeves .19 are externally screwthreaded and supported in screw-threaded openings 20 inthe frame 10. The sleeves 19 are provided with internally screwthreaded portions. The internal screwthreads of the sleeves 19- are of much less pitch than the external screw-threads.

Fixed to the outer ends of thespindles 18 are gear segments 21, which are arranged .to coact with gear segments 22 on the outer ends of the sleeves 19. Extended through the sleeves 19 are screw-threadedbolts or shafts 23. v p

On the inner endof each shaft 23 is a brake shoe, comprising a head 24' swiveled on the inner end of the shaft and having a brake pad 25 on its .inner face and adapted to frictionall-y engage the face of the drum 11, when the shaft 23 or the sleeve 19 is adjusted longitudinally inwardly td .ward the drum. rangement and combination of the, var1- On the outer'end of each shaft 23 isa' knurled head 26..

In the practical use of my improved brake and tension device, the device is, installed as shown in the drawings and as heretofor explained. V

The paper is threaded through the machine and, extended underneath the roller 16 and'thence overthe roller l i. g Assume that the partshave been; so adjusted that when the roller 16 is at its lower limit of movement,; thev brake shoeswill bei in firm engagement: with therfaces ofthe drum 11. Thenwhen the machine is started upand the paper is pulled through,- it will be seen that the slack'in the paper will 1 first be taken out, andgthe roller 16 will .be'

r lifted from its lower position to a higher position. v

The weight of the roller 16 will impose tension on the paper during the time the slack is being taken out, and will prevent 7 any such jerk on the paper, as willbe likely to tear it in two.

As the roller 16 is raised, the segmental gear 21 will be rotated on theshaft 18 and will operate the segmental gear 22 for rotating the sleeve 19, screwed outwardly.

It will be understood that the screwthreads between thesleeve 19 and the frame of the machine are right-hand or left-hand threads, depending upon the location of the and the necessity for screwing the parts,

when the roller 16 is sleevesfoutwardly, raised. 7

When the machine stops, the roller 16 will move downwardly, following the slack of the paper, thereby actuating the sleeve 19 for screwing it inwardly and causing the brake shoes to engage the faces of the drum 11,

It will, of course, be understood that the shafts 23 may be adjusted, as may be desired, for controlling the operation of the brake device, and also for readily permitting the brake device to be rendered inoperative.

I preferably use segmental gears on account of, the saving of material and also so 7 that if, for any reason, the roller 16 should be swung beyond a certain arc of a circle, the gears will move out-of gear and be theconnected. lhis is in some instances desir able.

It also makes it possible to very easily shift the gears, so that different teeth of one gear may be made to engage certain teeth of the other gear for getting adjustment of the deviceund'er all circumstances.

Some changes may be made in the arl rangem-ent and construction of the various parts'of my device, without departing from "the essential features and purposes of my invention, and it is my intention to cover by my claims, any modified forms of structure, or use of mechanical equivalents, which may be reasonably included within their scope. V I claim as my invention:

1. A structure of the class described, comprising a frame, a rotary device mounted thereon, a pair of sleeves having screwthreaded axially adjustableconnections with said frame, shafts having screw-threaded -mounting adjustable axially in said sleeves, brake shoes on said shafts adaptedto engage the rotary device', gear elements on said sleeves, a pair of arms pivoted on said frame having gear elements coacting with the respective gear elements on the sleeves, and'a roller supported between said arms,

which will thus be whereby the raising or lowering of the roller rotates said sleeves for imparting axial movement thereto for causing the shoes to act as brakes in engagement Wllllltl'lfi rotary device. V g

2. A structure of the class described, coma rotary device mounted thereon, a sleeve having a screw-threaded connection with the frame, a shoe supported on-said sleeve adjacent to the rotary deprising a frame,

ported on said arm, and means interposed between said arm andsaid sleeve for rotat vice, a pivotallymounted arm, a roller supj ing the sleeve according to the pivotal move- 'ment of the arm for imparting axial movement to the sleeve for 'IIIOVIIIg the shoe toward or from the rotary devicefor' performing the braking function. V

3. A structure of the class prising a frame, a rotary device mounted thereon, a sleevehaving ascrew threaded connection with the frame, a shoe supported on said sleeve adjacent to the rotary device, a pivotally mounted arm, a roller supported on said arm, and means interposed between said arm and said sleeve for rotating the sleeve according to the pivotal movement of the arm for imparting axial movement to the sleeveto bring the, shoe intofengagement with the rotary device to perform a braking function, said means beingarranged to be come inoperative when the arm swings in either direction. past certain positions.

i. A structure of the class described having a frame, a rotary-device mounted thereon, a sleeve having a screw-threaded connection with said'frame, abrake shoe having an adjustable connection 'with said thereon, and coacting devices on said sleeve and arm, whereby the swinging of the arm rotates said sleeve in its screw-threaded mounting for imparting axial movement to the sleeve to thus'move the shoe toward or from the rotary member.

axially moving the sleeve for causing the 7 shoe to perform its braking function.

' 6. structure of the class described comprising a frame, a rotary device mounted thereon, a pair of sleeves havinga'screwthreaded connection with said frame, shoes having an axially adjustable mounting on said sleeves-adjacent to opposite sides of said. rotary device, apair of arms pivoted on said frame, a roller supportedbetween a rotary device-mounted therei a shoe having a 7 described, 'comsleeve, a pivoted arm, a roller supported said arms and means for rotating the sleeves according to the pivotal movement of the arms and imparting axial movement to the sleeves for moving the shoes into and out of engagement with the rotary device.

7. A structure of the class described, comprising a frame,'a rotary device mounted thereon, a pair of sleeves having a screwthreaded connection with said frame, shoes adjustably mounted on said sleeves adjacent to opposite sides of said rotary device, a pair of arms pivoted on said frame, a roller supported between said arms and means for rotating the sleeves according to the pivotal movement of the arms during part of said movement for thus imparting axial movement to the sleeves and causing the shoes to perform their braking funct-ion, said coacting devices being arranged to be disconnected during other parts of said movement. V

8. A structure of the class described, comprising a frame, a rotary device mounted thereon, a pair of sleeves having screw- 2 ing to the pivotal movement 'of the arms for imparting axial movement to the sleeves and moving the shoes toward or from the rotary member in the performance oftheir braking function- Des Moines,Iowa, February 3, 1922. v

ERVIN E. 'STRAWN; 

